text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * Copyright (c) 2022, the SerenityOS developers.
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <LibCore/EventLoop.h>
  #include <LibGUI/Desktop.h>
  #include <LibGUI/Dialog.h>
  #include <LibGUI/Event.h>
  
  namespace GUI {
  
  Dialog::Dialog(Window* parent_window, ScreenPosition screen_position)
      : Window(parent_window)
      , m_screen_position(screen_position)
  {
      set_modal(true);
      set_minimizable(false);
  }
  
  int Dialog::exec()
  {
      VERIFY(!m_event_loop);
      m_event_loop = make<Core::EventLoop>();
  
      auto desktop_rect = Desktop::the().rect();
      auto window_rect = rect();
  
      auto top_align = [](Gfx::Rect<int>& rect) { rect.set_y(32); };
      auto bottom_align = [this, desktop_rect](Gfx::Rect<int>& rect) { rect.set_y(desktop_rect.height() - Desktop::the().taskbar_height() - height() - 12); };
  
      auto left_align = [](Gfx::Rect<int>& rect) { rect.set_x(12); };
      auto right_align = [this, desktop_rect](Gfx::Rect<int>& rect) { rect.set_x(desktop_rect.width() - width() - 12); };
  
      switch (m_screen_position) {
      case CenterWithinParent:
          if (parent() && is<Window>(parent())) {
              auto& parent_window = *static_cast<Window*>(parent());
              if (parent_window.is_visible()) {
                  window_rect.center_within(parent_window.rect());
                  break;
              }
          }
          [[fallthrough]]; // Fall back to `Center` if parent window is invalid or not visible
      case Center:
          window_rect.center_within(desktop_rect);
          break;
      case CenterLeft:
          left_align(window_rect);
          window_rect.center_vertically_within(desktop_rect);
          break;
      case CenterRight:
          right_align(window_rect);
          window_rect.center_vertically_within(desktop_rect);
          break;
      case TopLeft:
          left_align(window_rect);
          top_align(window_rect);
          break;
      case TopCenter:
          window_rect.center_horizontally_within(desktop_rect);
          top_align(window_rect);
          break;
      case TopRight:
          right_align(window_rect);
          top_align(window_rect);
          break;
      case BottomLeft:
          left_align(window_rect);
          bottom_align(window_rect);
          break;
      case BottomCenter:
          window_rect.center_horizontally_within(desktop_rect);
          bottom_align(window_rect);
          break;
      case BottomRight:
          right_align(window_rect);
          bottom_align(window_rect);
          break;
      }
  
      set_rect(window_rect);
      show();
      auto result = m_event_loop->exec();
      m_event_loop = nullptr;
      dbgln("{}: Event loop returned with result {}", *this, result);
      remove_from_parent();
      return result;
  }
  
  void Dialog::done(int result)
  {
      if (!m_event_loop)
          return;
      m_result = result;
      dbgln("{}: Quit event loop with result {}", *this, result);
      m_event_loop->quit(result);
  }
  
  void Dialog::event(Core::Event& event)
  {
      if (event.type() == Event::KeyUp || event.type() == Event::KeyDown) {
          auto& key_event = static_cast<KeyEvent&>(event);
          if (key_event.key() == KeyCode::Key_Escape) {
              done(ExecCancel);
              event.accept();
              return;
          }
      }
  
      Window::event(event);
  }
  
  void Dialog::close()
  {
      Window::close();
      done(ExecCancel);
  }
  
  }
  